Klein Tools' 12-Inch (305 mm) capacity Adjustable Wrench is made of forged, heat-treated alloy steel for strength and light weight. Precision-machined jaws are assembled by hand to ensure smooth operation. Contoured handles make them comfortable to use.PRODUCT FEATURES:- Extra capacity allows use of a smaller size wrench to handle bigger jobs, especially in confined spaces - Forged heat-treated alloy steel for light weight maximum strength and long life - High polish chrome finish is rust resistant - Precision-machined jaws are individually chosen and assembled by hand for smooth operation - Contoured handles for comfortable use - Knurl turns smoothly for easy operation - Rail is ground for precision fit